Mechanical stoker for furnaces.



No. 736,207. A PATENTED AUG. 11, 1903.

I F. BURGER,

MECHANICAL STOKER FOR FURNACES. APPLICATION FILED SEPT. 26. 1901. noMODEL. I A z SHEETS-SHEET 1.

m A Q N 1.

, 3114mm V WHJHiZZZ/w g) Q m: uonms pnzns ca. PNQI'O-LITNO wAsumsTpu. n.cy

PATENTED AUG. 11,1903.

P. BURGER. v

MECHANICAL STOKER FOR FURNACES.

APPLICATION FILED SEPT. 26, 1901.

2 SHEETS-SHEET 2.

no MQDBL.

Q Q Q Q Q Q Q Q QMQMQNQMQMQMQMQMQMQ Q Q .Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q QQ Q Q Q Q Q Q Q Q Q Q QQQQQQQQQ Q Q Q Q Q Q Q Q M Q Q Q Q Q Q Q Q Q Q QQ Q Q 3 H van to;

I'm: NORRIS PETERS so wnotuLrmo wnsnmm'ou. n. c.

UNITED 1 STATES Patented August 11, 1903.

PATENT OFFICE.

FRANZ BURGER, OF FORT WAYNE, INDIANA, ASSIGNOR OF THREE-FOURTHS TO HENRYM. WILLIAMS, OF FORT WAYNE, INDIANA.

MECHANICAL STOKER FOR FURNACES.

SPECIFICATION formingpart of Letters Patent N 0. 736,207, dated August11, 1903.

Application filedSeptember. 26, 1901'. Serial No- 76.665. (No model.)

To all whom it may concern:

Be it known that 1, FRANZ BURGER, a citizen of the United States,residing at Fort Wayne,

dis

in the county of Allen and State of Indiana,

have invented certain new and useful Improvements in Mechanical Stokersfor Furnaces,of which the following is a specification.

My lnvention relates to mechanical stokers and which uniformly feedsfuel and which may be readily combined with means for advancing mymechanical stoker.

ing the fuel along the grate after it has been fed thereto. 3 Myinvention consists in a mechanical stoker of a form hereinafter to bedescribed, and it also consists in my improved stoker placed at one endof a furnace, as at the front end, in combination with means connectedwith the grate of the furnace for advancing the fuel along the grateafter it has been mechanically fed thereto by the stoker. t y

My invention is more fully described and shown in its many details ofconstruction and operation in the accompanying specification anddrawings, in which- Figure 1 is a sectional elevation of my improvedapparatus, partly in section, includ- Fig. 2 is a'transverse sectionthrough the fire-boxof a locos motive-boiler to which my mechanicalstoker has been applied. Fig. 3 is a plan view,partly in section, of apart of the fire-box, showing the stoker and also the means foractuating the same; and Fig. 4 is an enlarged section of one of theconveyers of the stoker.

Referring to the drawings, A represents the shell of a boiler, in thepresent instance a locomotive-boiler being shown of the fire-tube type,with tubes B and a fire-box C with a mud-ring D.

My mechanical stoker is adapted to feed fuel from beneath the grate of afurnace to and upon the same, and I prefer to arrange the stoker at oneend of the furnace, preferably at the front end, as shown in Fig. 1,and,

as shown, the fuel feeding devices of the stoker are arrangedtransversely of the furnace. These fuel-feeding devices according to myinvention comprise screw conveyers, which, as shown, are arrangedsubstantially vertically, and they are inclosed in casings consisting ofsubstantially Vertical cylinders 2, suitably supported from thefire-box. The bottom of the cylinders is formed by a plate 4, which alsoserves as a bearing for the screw conveyers, which are constructed inthe following manner: The plate 4 is provided with apertures, andbeneath each aperture is arranged a step '7, supporting shafts 8,suitably secured to the steps, while these shafts support the hollowspindles 9 of the conveyers. Connected to each conveyer are bevel-gears6, meshing with gears 12 upon a transverse cranked shaft 10,- actuatedby any suitable means, as through a worm 17 and Wheel l6, operated by anoscillating steamy-engine 22, receiving steam from thelocomotive-boiler.

I have simply described a convenient and suitable form of means foractuating the screw conveyers to turn them upon vertical axes, but anydesired means may be provided, since it is no part of my presentinvention.

It will be seen that the lower portions of the screw conveyers arebeneath the grate of the furnace, while the cylindrical casings 2 extendsubstantially to the surface of the grates. Fuel may be'fed to the lowerportions of the conveyers through a suitable chute 29, the top of whichis covered with means for determining the granulation of the fuel,(shown as a grating 27,) so that the fuel shall be of uniform size. Thechute 29 and grating 27 e2;- tend to the foot-plate 28. Upon feedingfuel to the chute 29 it passes downward and 9:) reaches the screwconveyers through side openings 3 in the casings 2, which side openingsmay be opened or closed at will by plates 30, forming means forregulating the number of conveyers which are in operation at one 9 5time, since by simply lowering one of the plates 30 communication fromthe chute to the conveyer-casing is out off, andhence feeding of thefuel will not take place so rapidly to the furnace-grate. The fuel uponreach- 10 ing the conveyers while they are being rotated upon theirvertical axes will of course be carried upward by means of the screwportions of the same and will be uniformly deposited upon the grate atthe forward end. The grate is formed with a stationary portion 23immediately adjacent the casings of the conveyers, while adjoining thisportion 23 are arranged tilting portions 14, each pivoted transverselyby pivots 15 and each provided with arms 31, rigidly connected thereto.The arms of alternate tilting portions 14 are then connected by suitableconnections 32, these connections 32 in turn being pivoted toconnecting-rods 13, connected to the cranksof the crank-shaft 10, theangle of the cranks being such that pairs of tilting portions of thegrate will be actuated alternately during the rotation of the shaft 10,the tilting taking place upon the pivots 15.

I have simply described a suitable arrangement of tilting grate portionsand am not to be understood as limiting myself to the precise details ofconstruction shown and described, nor to the precise arrangement oftilting portions, my object being to advance the fuel along the grateafter it has been deposited thereon by the screw conveyers, anddifferent forms of mechanical constructions may readily be devised fortilting the portions of the grate, not necessarily in pairs.

Itwill be readily seen that as portions of the grate are tilted the fuelwill be advanced, in this instance from the front to the rear of thegrate, and deposited upon the next adjacent tilting portions, which inturn advance it farther when they are tilted. Finally the fuel reaches adrop-plate 24, as shown, arranged to be dropped when desired, but atthis point the fuel has been substantially burned out and consistsprincipally of ashes and perhaps clinkers, which may be removed to theash-pit 26 through the operation of the drop-plate 24.

Without limiting myself to the precise details of construction shown anddescribed, I claim, and desire to obtain by Letters Patent, thefollowing:

1. The combination with a grate, of a mechanical stoker thereforconsisting of a substantially vertical conveyer for introducing fuel tothe grate from below the same, a chute leading to the lower end of theconveyer, and

a grating over the receiving end of the chute, substantially as setforth.

2. The combination with a grate, of a mechanical stoker thereforconsisting of a substantially vertical screw conveyer for introducingfuel to the grate from below the same, a chute leading to the lower endof the screw conveyer, and agrating over the receiving end of the chute,substantially as set forth.

3. In a furnace, the combination with a grate, of a mechanical stokertherefor consisting of a plurality of substantially vertical screwconveyers at the front end of the furnace for introducing fuel to'thegrate from below the same, a chute leading to the lower end of saidconveyers, and a grating over the receiving end of the chute,substantially as set forth.

4. In a furnace, the combination with a grate, of a mechanical stokertherefor, consisting of screw conveyers arranged in substantiallyvertical cylindrical casings at one end tiallyvertical cylindricalcasings at one end of the grate, said mechanical stoker extending frombelow the grate to the surface of the same, a chute for feeding fuel tothe conveyers, a grating over the receiving end of the chute, slidingplates for cutting off the entrance of fuel to the conveyers, and meansfor actuating the conveyers, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANZ BURGER.

WVitnesses:

JOHN Orro, GEO. D. CRANE.

